From 665821700b70f74b0fed9ceb745862afe3bcb9c2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BE=90=E6=B6=9B?= <midnite@outlook.com>
Date: Tue, 14 Jan 2025 06:08:01 +0800
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---
 color-module/src/reversing.rs | 36 +++++++++++++++++++++++++++++------
 1 file changed, 30 insertions(+), 6 deletions(-)

diff --git a/color-module/src/reversing.rs b/color-module/src/reversing.rs
index c9e364f..90137c6 100644
--- a/color-module/src/reversing.rs
+++ b/color-module/src/reversing.rs
@@ -13,9 +13,21 @@ pub struct MixReversing {
 
 impl MixReversing {
     pub fn from_tint_rgb(basic_color: Rgb, mixed_result: Rgb) -> Self {
-        let r_factor = (mixed_result.red - basic_color.red) / (1.0 - basic_color.red);
-        let g_factor = (mixed_result.green - basic_color.green) / (1.0 - basic_color.green);
-        let b_factor = (mixed_result.blue - basic_color.blue) / (1.0 - basic_color.blue);
+        let r_factor = if basic_color.red == 1.0 {
+            0.0
+        } else {
+            (mixed_result.red - basic_color.red) / (1.0 - basic_color.red)
+        };
+        let g_factor = if basic_color.green == 1.0 {
+            0.0
+        } else {
+            (mixed_result.green - basic_color.green) / (1.0 - basic_color.green)
+        };
+        let b_factor = if basic_color.blue == 1.0 {
+            0.0
+        } else {
+            (mixed_result.blue - basic_color.blue) / (1.0 - basic_color.blue)
+        };
         let average = (r_factor + g_factor + b_factor) / 3.0;
 
         MixReversing {
@@ -27,9 +39,21 @@ impl MixReversing {
     }
 
     pub fn from_shade_rgb(basic_color: Rgb, mixed_result: Rgb) -> Self {
-        let r_factor = (basic_color.red - mixed_result.red) / (0.0 - basic_color.red);
-        let g_factor = (basic_color.green - mixed_result.green) / (0.0 - basic_color.green);
-        let b_factor = (basic_color.blue - mixed_result.blue) / (0.0 - basic_color.blue);
+        let r_factor = if basic_color.red == 0.0 {
+            0.0
+        } else {
+            (basic_color.red - mixed_result.red) / (0.0 - basic_color.red)
+        };
+        let g_factor = if basic_color.green == 0.0 {
+            0.0
+        } else {
+            (basic_color.green - mixed_result.green) / (0.0 - basic_color.green)
+        };
+        let b_factor = if basic_color.blue == 0.0 {
+            0.0
+        } else {
+            (basic_color.blue - mixed_result.blue) / (0.0 - basic_color.blue)
+        };
         let average = (r_factor + g_factor + b_factor) / 3.0;
 
         MixReversing {